Printing-telegraph receiver



M. 8. KERR.

PRINTING TELEGRAPH HECEWER.

APPUCATION FILED APILZO, 19w.

1,330,472 Patented Feb.10,1920.

/nve/4 for. Mark 5. K9 rr.

UNITED STATES PATENT OFFICE.

MARK B. KERR. 0 NEW YORK. N. Y., ASSIGNOR TO WESTERN ELEGTRIG COMPANY,INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

1 $30,472, Specification of Application filed April 20,

To all who: it may rom'rr/t:

lle it known that 1, MARK ll. Knnn, a citizen of the l'nited States.residing at New York. in the county of New York. State of New York. haveinvented certain new and useful lmprovenn-nts in lrintinn-Telegraph.Receivers, of which the following is a full, clear, concise. and exactdescription.

This invention relates to printing telegraphs aml more particularly to atelegraph reeeivinp H -t('lll wherein the characters of a message may bereprod..eed in the form of a printed page.

The principal object of this invention is to organize a minimum numberof elements or devices into a compact unit which ill be capable ofrendering eilicient and reliable service in carrying: out the \ariousoperations necessary to the proper rccoihposing of t legraphic impulsesinto a printed message.

In accordance with this invention there is provided a plurality ofelectroresponsive devices. each of which is capable of performingcompound operations with respect to functions which are of a strictlymechanical nature, and other functions which relate more particularly tothe control of current carrying circuits. The mechanical and electricalrelation or arrangement of the various devices represent such a.coifirdination of parts as may result in a realization of the objectssought to be attained by this system.

This invention is illustrated diagrammatically in the accompanyingdrawing in which, for the sake of clearness. only so much of a telegraphreceiving system has been shown as will be necessary to a clearunderstamling oi the features of the invention.

Referring to the drawing, Figure 1 illus trates an organization ofreceiving devices suitable for practising the features of thisinvention; Fig. is a fragmentary view illustrating in detail a selectingunit employed in the system; Fig. 3 shows an alternote arrangement whichmay be substituted for the selecting unit shown in Fig. 2; while Fig. 4shows a condenser arrangement which may be substituted for a deviceindicated by the reference character 30 in the first figure of thedrawing.

In describing this invention. the reference numeral 1 is employed .toindicate a line conductor which may extend to a remote station (notshown), this line conductor being con- Letter P en Patented Feb. 10,1920.

1918. Serial No. 229.765.

nected through the winding of a polarized line rela 2 to earth. Thetransmission of messages in the present embodiment of this invention.is. for convenience, based on the tire-unit impulse code of Baudot. Aswell 'understood in connection with this code, each character or otheroperation necessaryto the printing of a message is conveyed by means offive impulse intervals formed by different combinations of positive andnegative currents. In arranging a system to be operated by this code, itis necessary to employ spacing and marking impulses, the spacingimpulses being the impulse which serves merely to retract the armatureof a line relay to its normal position, while the marking impulses biasthe relay to engage its contacts whereby circuits may be completed toset up action with respect to 1p wiring devices. In the present system,positive currents correspond with spacing im pulses while negativecurrents correspond with marking impulses. Accordingly, the armature ofrelay 2 under such. currents will be respectively biased to engage itslower most or idle contact stop or its uppermost contact stop,respectively. Therefore. each negative impulse incoming from the line 1biases the relay 2 to complete a cirsuit from a battery 3 to a collectorring 4 of a distributor A. Segments (r-10, positioned adjacent thecollector ring; 4, serve V therewith to form a path traversed from leftto right by a brush 5 which successively completes a circuit from thecollector ring 4 to these segments. As well understood in connectionwith multiplex working. incoming impulses from the line 1 will occur atthe moments the brush 5 is over corresponding ones of the segments 6l0.Therefore, assuming that a negative impulse is present in the line 1 atthe instant the brush 5 is over the segment 6. a circuit will becompleted whereby current from the battery 3 may traverse the contactsof the line relay 2, the collector ring 4 and the brush 5 to the segment(i, thence through the winding of a selecting magnet 11. to a busconductor 16 which is connected through normally closed contacts 43 of aright'hand release magnet 40 to earth. (,urrcnt through this circuitcauses operation of the magnet 11 whereby its contacts 20 are closed tocomplete a holding cir cuit which may be traced from a negatively poledbattery 19, through an associotod re- J armature contacts.

sistance unit, thence over the contacts 20 of the selecting magnet 11 tothe Winding of this magnet, in substitution of the battery 3 by nhichthe magnet 11 was initially operated. it will be noted that a condenser21 s c nnected in bridge around the windings or" the selecting magnet11. The purpose of this condenser is to secure prolonging of the currentinterval whereby operation of the magnet 11 will be assured. This effectresults From the fact vthat on the instant the brush 5 is over thesegment 6, as assumed, the condenser 21 will receive a charge from thebattery '8 and sincethe brush 5 moves at a relatively high speed itm'aypass from the segment 6 before the current through th winding of theselector magnet 11 wouh have built 11 sufiiciently therein to efi'eot ooration of this magnet. ()n the instant t abrush 5 passes from thesegment 6, the condenser 21 will discharge in closed circuit through thewinding of this selector magnet and thereby complete the operation ofthe magnet which will be retained operated in the locking circuitalready traced. throng l the contact: 0. In a corresponding manner, acircuit from the battery 3 may be closed by the brush 5 through themagnets 12-15, as the brush successively passes over the eeg' menis7-----l.0, provided that at such corrcspending moments m-zgativeimpulses are received over the line 1 to close the active contacts ofthe polar relay 2. It will be obvious that at such moments as poeitiveimpulses are biasing the relay 2 to its idle contact position in phasewith the instants the brush 5 may be over either of the segments 6-10,no circuit may be completed through the distributor, and the associatedselector magnets will accordingly remain unoperated.

Referring to Fig. 2 of the drawing, a magnot 115, armature 116 andcontacts 117 Will be understood as corresponding with each selectormagnet 11-15 and its associated In addition to the armaof these selectormagnets V pivoted l to control a member 120 W'lUCll cna aclector disk101. at a notch 12], in i manner that movement of this arma cause thedisk 101 to be rotatedon to a limited extent. The armature proportionedthat it will respond quickly to current through the magnet ed act inadvance of the disk contrnlarmature 118. This is to insure that turn116, each one a lso carries an armature 118whicl1 is Al i 1 contacts11?, which correspond with the llz'iiztt'lifi of the selector magnet 11and the corresponding contacts of the other selectin magnets l2 15, andwhich are under tie control of the armature 116, will be closed morenearly coincident with the beginning of the current impulse through them; L 115. thereby establishin a locking circuit Whirl] corresponds witht e holding I last four impulses circuit already described in connectionwith of the drawing. As well understood in the art, the five selectingmagnets -11--1'5 and the associated selecting disks 101-105 c0rrespondrespectively with the five unit impulse intervals of the transmissioncode employed in this system.

In the present system selecting o perations are carried out in a.manner:- siiiniilar to that shown in Patent No. 1,201,809 to A. F.Dixon, October 17, 1916, it being provided that notches at predeterminedpoints around the periphery of the selecting disks, as the notches110-413 (Fig. 2), be so arranged on the several disks that right-angleselecting levers, as the levers 03, 70, 73, 76, etc., may not normallyenter these slots due to the fact that a notch in at least one of thedisks will be out of alinenient with. similar notches in the otherdisks. In response to the operation of one or more of the selectingmagnets 11--15, however, the correspondingly associated disks will hemoved in such a manner that at some point adjacent a selecting lever thenotches in the five disks will jointly pr sent an alincd opening toreceive the corresponding lever, following which, operations may takeplace either into a printed character or other operation of thereceiving devices necessary in the reproduction of a messag Asan'example whereby the operations necessary in the reception of oneimpulse combination may be traced, let it be assumed that a character,say the letter E, which is represented by a first negative impulsefollowed by four positive impulses is received from the distant station.In phase with the first negative impulse, the brush 5 of the distributorA, will be present over the segment '6, thereby completing the circuitalready traced from the battery 3 to operate the selecting magnet 11.Operation of this magnet will revolve the disk 101 sufliciently to bringa notch in this disk into alinement with notches in the remaining disks102- 105 which stand normally alined. Since the from the distant stationare of positive polarity, no action will take place with respect to theselecting magnets 12 during the time the brush 5 is traversing thecorresponding segments 7-1'0. In order to describe a further operationcarried out by either one of the selecting disks to translate suchselection 101--105 which relates to the c.-i trol of auxiliary contacts.6, a brief digression from the example under consideration will now bemade.

In addition to the notches in the disks and the selecting leversrespectively associated therewith. each dish carries an ontstandinmember 21 adapted to engage a' ivoted member 25. which in turn controlst e contacts .46. During the time the disks are in their normalposition, the contacts 26 remain open, as shown in the drawing, but whenany one of the di ks 101-105 is moved by its respective magnet in makina selcchon. the corresponding member 4 of the shifted disk will engageand-move the mast r member to close the contacts 526. 'lhcrefore. in thepresent example, in addition to alining the notches of the disks toreceive, say, the selecting lever 63, movement of the disk 101 alsoaffects closing of the contacts 26. While the circuits are in thiscondition the brush 5, after passing from the segment 10 and thecollector ring 4, joins a segment 28 with a segment :29, therebycompleting a master circuit from a groim ed battery 27 through thecontacts 2G and the winding of a release control magnet 30. Operation ofthe'la'tterimagnet 80f com letcs a -circuit from the grounded atite: 531through contacts 32 of this am et,

5 by way of a bus conductor '33 through att c-parallel paths, the firstofiwhich'coman operating winding 41 of therlght- 85 and'release magnet40, while'theij secoud path extends through the opcrating winding ,51',0f a left-hand release magnet lio m L' 'nt" ,L

fax-mature 44 of the magnet 40,-wh1 ns pivfeted at 45,-is. now attractedto can: separa- (0 'tioiifif the contacts 43 and alsos'at its rout-"standin end to release downward pressure normal y exerted against the'inwardlyextending angle of selecting levers as the lever (33. At thesame instant, armature 54 of 45 the magnet 50, which is pivoted at 55,is also attracted to close its contacts 53 and at its outstanding end torelease retaining pressure which it normally exerts against selectinglevels which, it will be understood,

are positioned under this lever in amanner j corres )onding with theposition of the lever 63 under one end of the armature 44. Forconvenience of description, it may be understood that the selectinglever63 corresponds 3-5 with the control necessary for the irinting ofthe letter I) assumed in the exam le under discussion. It will also bepointetl out that selecting levers 70, 73. 76, 79, 82, 85 and 88although shown, for convenience in the drawing, remote from theselecting crown formed by the disks 101-105. will neverthens beunderstood to'be suitably positioned around the selcting disks in amanner cor-' responding with the position of the lever 63. and further,it will be understood that The the outstanding ends of the armatures 44and 54 of the release magnets are enlarged in the form of a semi-circle,thereby rendering each arm capable of controlling the respectivedepressing or releasing of all selecting levers positioned on thecorresponding side of the selecting crown. It may also be here mentionedthat in addition to the selecting and printing of the words of amessage, various auxiliary operations. such as, letters-spacing.carriage-return, line-feed, lcttors-shift, figures-shift. break-signal,etc.. are necessary in the proper control of a receiving printer. In thecommercial operation of printing tclegraphs such operations are commonlyreferred to as stunts and in the present illustration of this inventionSilt h operations are under control of the selecting levers other thanthe selecting lever 63. ]u proceeding with the example underconsideration. following the o )eration of the release magnets 40 and 50as described, a retaining circuit for these magnets mav be traced from agrounded battery 39 way of contacts 71 offline feed controllever 70,contacts 74 of space control lever 73, contacts 77.01 carria gc return'controllever't'tl, contacts 83 of ti ur;shi ft eontrdhlev er'82,contacts 86 of lo tersishift commune; 85, the contacts 96 tof ja shiftmagn' et 93,,jthe winding of a stia, 56..the"contacts 53 of the releaseI mutate o'filf two parallel. paths, .l. "g firstlof which' eittendsthrough windingq'tigof the release maple 50,

while the sccondf rath eittendsft'hro li the windings 42 of tlrpe leasemagnetgip," lfence merging at and jeqnt i milng through tgiecontacts 68of a spacip" lira et G'Ltd''ail, In addition to prqvi ng: oldingciitcuitsfjfor the release ma "e'teffl lo. and '50,"'f('5 i irrentthrough the patlil ti-accd effects smallness of the startmagnetfifivwhicl attracts'itsjiirmw ture to remove a holding pawl57'from engagement with a ratchet wheel '58 thereby releasing a shaft 59which carries a type wheel 60. The shaft 59 is continually stressed bymeans, not shown, tending to cause it to revolve in the dircction of thearrow; therefore, the releasing of this shaft by the start magnet 56permits it to revolve until a conducting arm 62, which is rigidly fixedto the shaft, engages the inwardly extending end of the selected lever63which is also of conducting material, the end of the lever 63 havingbeen raised into the path of the stop member 62 by action of aretractile spring 38 which moved the downwardly extending arm ofthe'lever 63 into the. aliucd slots of the disks 101-J05 following suchpositioning of the disks under the action of the five impulses underconsideration. The selecting lever is piv oted in the manner of a bellcrank lever, as indicated by the conventional pivot spotting on eachlever. In addition to mechanically windings an the circuits is to comstopping the rotation of the type wheel shaft 59, engagement of the arm()2 with the lever (33 also completes a circuit from a source ofgrounded current 61 which may then extend through a printing magnet (3Gand the winding of a spacing magnet 67 to earth. As well understood inconnection with printing devices of this character, the letter E of thetype wheel will now be positioned at a proper point with respect to animpression sheet (i-l, usually of paper, for receiving the messagerecord, and an armature (i5 operated by the magnet (36 will now respondto thrust the paper against the type wheel, thereby printing thischaracter. The time constant relation of the magnet 66 with respect tothe magnet 67 is such that the first or printer magnet will operate inadvance of the latter spacing magnet; therefore the n'inting operationwill have been completed before the armature of the magnet 67 has movedsuflicientl to separate its contacts 68 whereby the holding circuitsthrough the windings 12 and 52 of the magnets 40 and :30 are opened. Itwill be noted that the release control magnet 30 is of a slow releasetype as indicated by the conventional copper core-sleeves in thedrawing. This is to insure that the o ratin circuit traced through themagnets 0 an 50 may continue for a sufliclent time to ermit the carryingout of stunt operations on which no printing is required as willpresently appear. As an alternate arrangement, a con-, denser 125 '(Fi.4) may be substituted for the relay30. 11 making this substitution,-aftcr dispensin with the relay 30 and battery 31, one and of a lead 127may be connect/ed to thebus conductor 33, while the opposite end of thislead may be connected to the conductor which extends from the contacts26. The condenser 125 as connected to. earth from the lead 127 thenforms a circuit parallel to'the windings 41 and 51 of the ma ets 40 and50 to act in prolonging 0r acre crating the operation of these magnetsin a manner similar to that already described in connection with theaction of the' condensers connected in bridge on the selecting magnets11-15. This arrangement of ensatc for the relativel short eriod of timedurin which the brus 5 of t is distributer may e over the segments 28and 29 in completing the operating circuit already traced for energizingthe release control magnets 40 and 50; At the instant the spacing magnet67 operates,

the relay 30 will ordinarily have already released and separated itscontacts 32; therefore. separation of the contacts ,68 of the spacing manet disconnects the holding permits the release magnets 40 and 50 torestore. Cessation 0 current through the holding circuit of tle releasemagnet alsoefiects restoring of the start .parallel with the contacts 43of magnet 56, whereupon the pawl 57 reeir ga es the teeth of the ratchetwheel :38 to hold the type shaft 59 stationary. Therefore, when theoutstanding end of the armature 4i descends to depress the end of theselecting lever (33 to clear the stop arm 62 and cause the opposite endof the lever to move outwardly in clearing the disks 101-105, the shaft59 will be held stationary while the disks will assume their normalpositions prepared to receive another selec tion from their respectivecontrol magnet, while the contacts 43 of the release magnet 4% will bereestablished to complete the operating circuit of the selecting magnets11--l5.

In order to secure an overlap tellect, which is an operation understoodin connection with printing telegraphs, the contacts 69 ot' the spacermagnet (57 are connected in the release magnet 40, thereby insuring thatduring the time the spacing" magnet ma be operated the contacts 69 willbe closed in substitution of the contacts 43, thereby providing acircuit to permit initial operation of the selector magnets 11-15through the contacts 9 to ground instead of through the contacts 43.This isdesirable in case a lag should occur with respect to the releasinof the magnet 10and the corresponding cfiising of the contacts 43. Inaddition to performin the circuit control operations as describe thearmature ofthe spacer magnet 67 also effects mechanical operationswhereby movement of the paper 64 will take place in order to picscnt a.clear or new surface for the printing of a next character.

The type wheel 60 carries the usual double rowof characters. As shown inthe drawing, the lower row comprises letters while the upper row isformed of figures, punctuations and also certain vacant spacescorresponding with some of the stunt operations which will be presentlydescribed. The ty e wheel 60 is arranged to be moved vertica ly on theshaft 59, such vertical movement being under the control of an armature92 of the shift control magnet 93. Shift operations are usuallyreferredto as the operations whereby either the letters or the figures may bebrought to the proper printing point or alinement with the receivingsheet. Such operations are, of course, under the control of the distanttransmitter and are referred to as letters-shift or figuresshiftrespectively. As shown inthe drawing, the type wheel is positioned forthe printing of letters; therefore, let it be assumed that a combinationof five impulses is now transmitted from the distant station whereby thetype wheel will be shifted for the printing of characters in the figuresrow.

llli) brush 5 may be passing over the segments (1 and 7 in phase withthe. two first incomin negative impulses from the line 1. the rclry "2will establish the battery 3 over the cii cuits already traced andrespectively elicct operation of the sclectoiimapmcts lland 12. Thethird impulse being of positive polarity and corresponding with aspacing interval. no effect. will take place at the instant the brush 5is over the segment 8. At the instant the brush successively passes overthe segments 9 and 10, however, the last two negative impulses willposition the line re lay 2 to etl'ect operation of the selecting magnetsIt and 15. 'Ihcse selections result in the movement of the disks 101,102, 10% and 105. Assuming that such position of the disks presents analinement of notches whereby a figures-shift lever 82 may enter suchnotches, the response of the magnet 30 as the brush 5 passes over thesegments 28-29 will establish operation of the re lease magnets 40 and50 as already described. Operation of the selecting lever 82 therebypermitted, establishes a circuit which may be traced from hattcry 39 byway of the contacts 71. 74, 77 and Ri of the levers 70, 2'3, 76 and 82,respectively. thence through anassociated resistance and a, wind ing 94of the shift magnet 93 to earth in responding to current through thispath, a self-locking circuit is established from a batterv 37 through anassociated resistance and the contacts 98 of the relay 93 to the winding9-1 in substitution of the battery The armature 92 of the relay 93, bymeans not shown, may now move the type 'wheel 60 downwardly to presentthe upper or figurcs row of characters in alinemeut with the printingarmature 65. The present shift op eration being a strictly mechanicalone no printing is required: therefore, separation of the contacts 83effected by the described movement of the selecting lever 82 disconncctsthe start control circuit in order to insure suspension of printingaction at this time. Since no circuit may now be completed through thestar magnet 56 and the holding windings 42 and 52 of the release magnets40 and 50 only a. momentary operation of the latter magnets will takeplace in phase with the passing of the brush 5 over the segments 28 and29. From the de scription already given it) will be clear that for thisstunt operation on which printing is not required the response andrelativciy nondclayed restoring of the release magnets 40 and 50, res'iectively. correspond with the releasing of the selecting lovers 0%.70. etc. separation of the contacts 43 to p rmit restoring of any of theselecting magnets. which in the present example correspond with theselecting magnets 11, 19, I4 and 15, and the depressing of all theselecting lovers to clear them from the disks. In the present -ingcircuit previously traced, a substitute circuit whereby energization ofthe start niagnet fifi and the holding of the release magnets 40 and 50may be cfl'ectcd for printing in the figuresshii't position. will now heconsidered.

It is well known that combinations of impnlses employed in selectingcharacters in the letters-row of type may also be cmployed forselections in the figures-row of type. For example. the letter R and thefigure 3 usually positioned in their re spective row of type are inalinemcnt, one with the other, and selectable hy the same combination ofimpulses, thcret'orc. since one negative followed hy. four positiveimpulses may select the letter E during the time the printer may be inthe letter-shift position as already assumed. the same combination ofimpulses may select the figure 3 during the time the type Wheel may beheld in the figures-shift position. Accordingly, let it be assumed thatsucha combination of impulses is now received from the distant stationas described for the letter E. Such a, combination of impulses resultsin the operation of the selecting relay 11 and movement of the disk 101while the selecting magnets 12-----l5 continue inert and thecorresponding disks 1U2-105 would also continue in their normalposition. The contacts 26 being also closed through the movement of thedisk 10l, as described, the brush 5 in passing over the segments 28 and29 e ects op eration of the magnet 30 to in turn initially operate therelease magnets 40 and 50. The lever 63, as previously assumed,corresponds with the present selection and is released by the lifting ofthe armature 44 to enter the alined slots in the disks, thereby standingpositioned to engage the stop arm 62. At such instant the combinedstarting and holding circuit will now be established from the battery 39by ray of the contacts 71, 74, T7, 83 and 8-6 of the respectiveselecting levers 70, 73, 76, 82 and 85, thence this circuit continuesthrough the contacts 97 of the shift magnet 93, the contacts 80 of theselect-- ing lever 79, the contacts 89 of the through selecting lever88. thereafter continuing over the circuits already traced, through thewinding of the start magnet 56 and the holding windings 42 and 52 of therelease magnets 49 and 50 respectively, thence by way gizalion oi themagnet 135 causes the carriagc For the paper (it to be moved to itsreturn iHir-ltl ll for the beginning of another li e. at which point thecontacts 137 are opened by m cchanism, not shown, to deencrgizc thecarriage return ma net 135. A manually operable key 141 is also providedfor controlling operation of the carriage return magnet 135, as may bedesired by an attendant at the receiving station. A resistance unitconnected in parallel with the winding of this carriage return magnet135 is for the purpose of absorbing inductive current surges from thisWinding.

When spacing other than the single clearance spacing as between theletters of a word, etc., is necessary. as required bet ween words,figures, ctc.. spacing impulse combine. tious are transmitted from thesending station, such selecting combination usually (0UP prises twopositive, a negative and two positive impulses. A spacing combination results in the operation of the selecting relay 13 and a correspondingmovement of the disk 103. the release magnets 40 and 50 re sponding. asdescribed, to permit the space selecting lever 73 to move intoadjacently alincd slots in the selecting disks. No printing beingrequired for this operation. separation of the contacts 74 of the lever73 dis connects the common start and loci-7 control circuit andestablishes a Cll'fillil-f1l)11 the battery 39 by way of the contacts 71and 75 of the levers 70 and 73 respectively, thence by way of aconductor 138 through the Winding of the spacing magnet 67 to earth.Such operation of the spacer magnet mechanically steps the sheet (54ahead. Such advance usually corresponds with tlife space interval of asingle character; therefore, for additional spacingmovement,.rcpctilions of this impulse combination arc'required from thedistant sending station which will result in single step spacing asdescribed.

in the handling of telegraphic service it is frequently necessary for anattendant at the sending station to communicate with an attendant ,atthe receiving station and'in printingtelcg'l'uphs this is ordiuarilvcarried out by means of one or more strokes or single operations of asignal hell. on the bell being translated in accordance with apredetermined. arbitrary code. usuallv relate to requests as follows:start. rerun. re-punch. slop. etc. Each counnunication of impulsestransmitted corresponds wi a single operation or tap ot' the bell aIn inorder that tho receiving circuits may be 1.1 proper position for thereception of such signals it is necessary that the printer first. be stto the figures-shift position: therefore. a combination of impulsesfirst sent out by the tran mitting station is com posed of two negative.:1 positive and two negative impulses. This impulse combina- Suchstrokes.

tion results in the operal ion of the sclccti ng; l"\\t' F1: \i'licrch vinitial cuergizatiou ol the hift magnet 5923 takes place. followingwhich this magnet is retained locked through itcontacts J8, as alreadydescribed. Dining the time the receiving devices are in this fig urcsshitt position. a combination of two negative. a positive. a negativeand a positive impulse which ordinarily corresponds with the letter Jfor the lettersshit't posi tion of the printer, will result in theoperation of the signal. Such a combination of impulses effectsoperation of the select. ing magnets 11. h'and ll to (t)l'llfb-lIUHlingly more the disks 101. 10;: and lot to permit the signal controlselecting lever it) to move into associated alincd slot. of the disks.Since no printing is required during the signaling operation, contacts 8of the. lever T9 are now separated to disconnect the start and lockcontrol circuits. nlready described. while a circuit is completed whichmay be traced from the battery 39 by way of the contacts 71. 74, 77, 83and S6 of the selecting levers 70. T3. 76, and 85 respi ctivcl v. thencecontinuing over the contacts 97 (now closed.) of the shift magnet 93 andthe contacts 81 of the lever 79. and through a signal 40 to earth.Current through this circuit results in a single operation of the bellH0 and since the signal operating selection as set up by the receiverequipment is cleared out following the ad vance of the brush 5 from thelocal control segments '38 and 29. additional operations of the hell arectl'ccted only in phase with addi tional or repeated transmission of thesignal combination of impulses already i'lcscribcd.

The selecting lever 88 corresponds with stunt operations commonly knownas through." In certain situations this operation applies to theautomatic control of a repcrt'orator whereby operations carried out atthe receiving equipment will prepare a tape record of a message receivedin order that the tape may be employed in retrain iuittiug' the messageto another station. .111 other situations the through operation mayrelate to the control of a. second signal bcll known as bulletin. Thissignal is usually operated for the purpose of calling' the attention ofattendants to items of particular importance which may be comingthrough, in initiating a through signal from the transmitting station. acombination of hu pulses for shifting the type wheel of the printer intothe figures position first carried out as already described. The"through" position on the figures row of tvne corresponds with theletter S; therefore a negative, positive, negative and two positiveimpulses. which correspond with the letter S. must be'transmitted forcarrying out this stunt operation. ()n the reception of these impulsesthe lever 88 will move to s parate its contacts 89 and to close itscontacts H0. Separation of the contacts 89 will disconnect one branch tothe start aiid lock control circuit while another branch of this circnitstands disconnected at the separated contacts 96 of the shift relay 93.Which now stands locked in its operated position as effected by thereception of the combination of impulses already assumed to have beenreceived for shifting the receiver to the figures position. Thisdisabling of the start circuit is to prevent printing during the timethe through operation is under way. The circuit which may be traced fromthe battery 39 extends over the contacts 71, 74. T7, 83 and 86 of theselecting levers 70, 73, T6, 52 and H respectively, continuing from thispoint over the contacts 97 of the shift magnet 93. thence over thecontacts 80 of the se ecting lever and the contacts 9,9, of the.selecting lever to a conductor 91. It will be understood that theconductor 91 may be connected to suitable devices for the operation of asignal, or to such devices as may control the conditioning: of areperforator mechanism for translating a message, which may now follow,into a tape record as well as a printed record. lnlCitSB a throughoperatirm conditions the equipment for reperforating work. the devicesare usually arranged so that rcpcrtorating will continue until such timeas the transmitting station may send out arertain combination ofimpulses which will control a electing lever (not shown) to discontinuethe reperforatin operations.

eierring to the alternative disk control arrangement shown in Fig, 3 ofthe drawing. the selecting disk lQl magnet 115, armature 116 and thecontacts 117 controlled by this armature, will he understoodascorresponding with the similarly designated parts shown in Fig. 2 ofthe drawing. An armature 122 is secured to the periphery of theselecting: disk 161 in such a manner that energization of the magnet 115attracts he armature 122 to move the disk 101. Such movement of the diskmay correspond with the moveirent which may be set up by operation ofthe armature 118 (Fig. 2). Referring to Fig. 1, each of the selectingmagnets l115 may therefore be arranged to respectively controlarm-stares, as the armature 122. which may he provided for each one ofthe selecting disks 101 105.

From the fm'e oing description it will he clear that the seer-tingmagnets 11--l5 perform the compound operation of mechanicallycontrolling! the ill. s {ill--?) and also the closing cl self-hawkingcircuits for re- :-pc;:tivcly continuing their cnergi'aation. It willalso he pointed out that the two coils o each of these selecting magnetsare con- 'lfl ftr l in parallel, one coil with the other.

s to secure an advantage with recard to the time constant of theiroperation.

It will also be noted that the spacer magnet 67, shift magnet 93, linefeed magnet 130 and carriage return magnet 135 are each arranged in amanner to perform compound operations with respect to mechanicalfunctions and the control of electrical circuits. It will also be clearthat the present embodiment of this invention provides that, by thesystem of interconnections described between the various stunt selectinglevers and other control devices of the system, the mat ter of printingintervals and non-printing intervals may be entirely under the controlof the distant transmitting station, while the operations with respectto movement of the type wheel from figures to letters position, and viceversa, may be carried out by means of a single electro-responsivedevice.

Referring to the various condensers and associated resistances notpreviously mentioned, these are for the purpose of eliminating sparkingon the different contacts, as the contacts 131 of the line feed magnet130, the contacts 81 of the selecting lever 79, the contacts 8i of theselecting lever 82 and the contacts which may he completed through thestop arm 62 of the type wheel shaft and diflerent ones of the selectinglevers,

Although the present embodiment of this invention represents what isconsidered to be a preferred arrangement for carrying out the featuresof this system, it will be understood that various changes in theorganization of the equipment may be made without dc arting from thespirit of this invention.

hat is claimed is:

1. In a telegraph receiving system, the combination with a printingdevice, of auxiliary function mechanisms, a plurality of devices forselectively controlling said mechanisrns, and a series circuitcontrolled by each of said selecting devices for disabling said printingdevice.

:3. In a printing telegraph receiver, a selecting mechanism comprising aplurality of selecting disks, an armature carried by each i of saiddisks, and a plurality of electromagnets cooperating with said armaturesto move said disks.

3. In a printing telegraph receivenla plurality of rotatable disks,selectingievers cooperating therewith to select the desired ch? tor forprinting, selecting magnets for honing said disks, contacts controlledby each of said magnets and arranged to close a holding circuit thereforwhen said magnet is energized, means for releasing said selectinglevers, and contacts actuated thereby for opening: said holding circuit.

4. In a printing telegraph receiver, a plurality of selectableelectromagnets, a. plurality of selecting disks, an armature carr d byeach of said disks and arranged to t'i. In a printing telegraphreceiver. the,

combination with a type wheel having a plurality of rows of characters,means for shifting said type wheel to bring a desired row of charactersinto printing position, an

/ clcctromaguet for operating said shifting means. an operating windingtherefor,'seltt'l'lllg mechanism for closing a circuit through saidwinding to energize said mag net. a neutralizing winding for saidelectromagnet, and a circuit therefor under the control of saidselecting mechanism for restoring said shifting means.

7. In a printing telegraph receiver the combination with a printingdevice, of auxiliary function mechanisms. a plurality of devices forselectively controlling said mcchanisins. contacts controlled by saidselecting devices, and a circuit for the control of said printing deviceconnected serially through the contacts of said selecting devices.

8. In a printing telegraph receiver, pluralities of characters, meansfor selecting said characters, a plurality of auxiliary functionmechanisms, a lurality of selectable devices for contro ling saidmechanisms, means for printing selected characters, a plurality ofcurrent paths for controlling said printing operations, and striallyconnected contacts at said selectable devices for controlling saidplurality of printing control current paths.

9. In a printing telegraph receiver, a type wheel, pluralities of rowsof type for said wheel, means for making, predetermined selection ofsaid type. a source of current, a compound-wound electromagnet, meanscontrolled by said magnet for controlling the selection of saiddifferent rows of type, selective means for including said source ofcurrent to act through one windin of said clectromagnet for effectingits initial operation, means for establishing said current to continuethe cncrgization of said ma met, and, selective means for includingSt\l( source of current with a second winding of said magnet to efi'ectits dei nergization.

It In a printing telegraph receiver, a type wheel, a plurality of rowsof charac- 'rality of contacts controller ters on said type wheel, meansfor selecting said type, and means for printing said selccted type, acompound-wound elcctromag net for controlling the positioning of saidrows of type with respect to a printing, point. a plurality of selectingdevices for the control of said clectromagnet, contacts controlledhysaid selectin" devices, a plu- Thy said magnet, and a ilurality ofcurrent paths jointly controlled tromagnet for controllinp said printingop erations.

11. In a selectin system. a plurality of characters, means r selectivelycontrolling said characters. means for printing said see lectcdcharacters. a plurality of auxiliary functionmechanisms. a plurality ofdevices ,for selectively controlling said mechanisms.

contacts controlled hy said selecting devices for said mechanisms, acircuit extending serially through the contacts of said mechanismselecting devices, and branches extending from various points on saidserially connected circuit for respectively controlling the operation ofsaid mechanisms.

12. In a selecting system, a ty wheel, a. plurality of rows of type onsaidwheel, a compound wound magnet for controlling the selection of saidrows of type, means for the selection and printing of said type, aplurality of auxiliary function mechanisms, a plurality of selectingdevices for controlling said mechanisms, contacts controlled by saidselective devices of said function mechanisms, a plurality of circuitsfor the control of printing operations separately routed through the.contacts of said mechanism selecting devices. and means controlled bysaid compound wound magnet for selectircly controlling said plurality ofcontrol circuits.

13. In a printing telegraph receiver, a type wheel, a plurality of rowsof characters for said wheell aneans for selectively controllin saidcharacters. means for rintin said se ected characters. a compoun woundmagnet for controlling the selection of said rows of type. a pluralityof auxiliary function mechanisms. selecting devices for contr lling saidmm-hanisms, contacts controlled by said m-chanism selecting devices, :1p111- ral'ty of circuits routed through the contacts oh, aid mechanismselecting devices for the control of the printing operations, and meanscontrolled by said compound wound magnet for transferring said printingcontrol circuit for use in performing auxiliary function 0 )erations.

14. n a printing telegraph receiver, a. plurality of characters. meansfor selectively positioning said characters at a printing point. meansfor printing the selective y podevices for the control of auxiliaryfunchv the selectim devices and said clec-' tine naachanisms, a compoundwound electromagnet for the control of certain said auxiliary functionmechanisms, contacts contmlled by said electromagnet and a circuitextending serially through the contacts of said'solectnble devices andof said electroin at for the control of the printing oper ons.

15. In a printing telegra h receiver, a plurality of characters a purality of de- Jices for selectively controlling said charactcrs. aplurality oi selecting magnets, a, pluralitv of armatures for saidmagnets, a. self locking circuit for each magnet, contacts controlled byone armature of each magnet for completiny this self-locking circuit,means'control ed by another armature of said magnets for respectivelycontrolling said character selecting devices, electroresponsivcimcunsfor operatirely controlling said character selecting devices, mastermeans responsive to each one of said character selecting devices, andcircuit control means operated by said master means to prepare a circuitfor the electroresponsive means which controls the operativeness of idcharacter selecting means.

1,sso,472

16, In a printing telegraph receiver. selectin g magnets, a plurality ofcharacters, selecting disks, means controlled by said soleeting magnetsfor novably controlling: said selecting disks, distributor menus forselectively controlling said magnets, master means controlled by themovement of saiddisks for preparing a master circuit, electromagnctscontrolled by said master circuit for releasing selecting levers to becontrolled by said disks in selecting from said characters, meanscontrolled by said distributer for energizing said master circuit, meansfor controlling the printing of a lectcd character, means controlled byszlltl electromagnets for completing said printing circuit, meanscontiol ed by said electromagnets for disabling said selectine magnets,a spacin magnet controlled liy said printing circuit. and contactscontrolled by said spacing magnet for iei stablishing an operativecondition of said selectin magnets in substitutionof the circuitdisalilcd by said electromagnets.

In witness whereof, I hereunto subscribe my name this 16th day of April,A. D., 1918.

MARK B. KERR.

